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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A254043 a(n) is the smallest number not already used such that the sum of the first n terms is semiprime.

Table of values

n a(n)
1 4
2 2
3 3
4 1
5 5
6 6
7 12
8 13
9 9
10 7
11 15
12 8
13 10
14 11
15 16
16 19
17 14
18 22
19 17
20 20
21 21
22 18
23 25
24 23
25 26
26 28
27 27
28 29
29 34
30 24
31 32
32 36
33 42
34 35
35 41
36 30
37 33
38 31
39 40
40 46
41 43
42 39
43 38
44 48
45 44
46 47
47 45
48 50
49 37
50 56
51 51
52 49
53 55
54 60
55 58
56 63
57 53
58 64
59 62
60 52
61 54
62 66
63 57
64 69
65 70
66 80
67 61
68 68
69 59
70 65
71 71
72 72
73 81
74 76
75 83

List of values

[4, 2, 3, 1, 5, 6, 12, 13, 9, 7, 15, 8, 10, 11, 16, 19, 14, 22, 17, 20, 21, 18, 25, 23, 26, 28, 27, 29, 34, 24, 32, 36, 42, 35, 41, 30, 33, 31, 40, 46, 43, 39, 38, 48, 44, 47, 45, 50, 37, 56, 51, 49, 55, 60, 58, 63, 53, 64, 62, 52, 54, 66, 57, 69, 70, 80, 61, 68, 59, 65, 71, 72, 81, 76, 83]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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